Asteroid Groups
Graphs and animations showing major asteroid groups and families.
Asteroid Observing Services from Lowell Observatory
Tools to help observers select targets and plan observations. Also, orbital elements, reference star catalog data and software, link to Lowell Observatory Near Earth Object Search…
Bill Bottke's Asteroid Research
Collisions, tidal disruption, dynamics, planetary impacts, crater chains and doublet craters.
Dan Durda's Research Interests
Airborne observations, Vulcanoids, various asteroid collision effects.
Eric Weisstein's World of Astronomy: Asteroids
Dynamical groups of asteroids, mathematical formulas, the Tunguska event.
Minor Planet Groups and Families
Listing and description of dynamical groups and physical families of asteroids.
Orrery: Asteroids
Basic information about asteroids, history of asteroid discovery, Bode's Law.
Small Main-Belt Asteroid Spectroscopic Survey II
Data sets and references to scientific literature describing results.
Solar System Exploration: Asteroids
Basic description, overview of asteroid science.
Views of the Solar System: Asteroid Introduction
Background information, details on selected asteroids, image gallery.
Wikipedia: Asteroid
Encyclopedia article covers history, groups of asteroids, spectral types. Tables of largest and notable asteroids.